Remove ICS and return to stock

Hi guys, I just bought a Rezound today. Switching from the Droid Razr. The guy I bought the Rezound from said he downloaded a leaked version of ICS but it isn't rooted. I'm not too familiar with this process and I would like to stay with the stock software. Right now I have android version 4.0.3, sense 3.6, software 3.11.605.22 710RD. Can anybody tell me how to get back to the stock? Also, if a newer software pushes out would I automatically get that update if I kept the current software? Thanks in advance.

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